Printing-stand.



N. DE CLARK.

PRINTING STAND.

APPLICATION FILED MAY 27, 1913. 1,092,095. Patented Mar. 31, 1914.

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N. DE CLARK.

PRINTING STAND.

APPLICATION FILED MAY 27, 1913.

1,092,095. Patented Mar. 31, 191* 2 $HEETS-SHEET 2.

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NELSON DE CLARK, OF JERSEY CITY, NEW JERSEY.

PRINTING-STAND.

Specification of Letters Patent.

Patented Mar. 31, 1914.

Application filed May 27, 1913. Serial No. 770,210.

To all whom it may concern:

Be it known that I, NELSON DE CLARK, a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jersey, have invented new and useful Improvements in Printing-Stands, of which the following is a specification.

The general object of the invention is to improve the construction of the presser board operating mechanism shown in my prior patent of January 28th, 1913, Number 1,051,700 in point of general efficiency and requiring a simple and easy limb movement to operate the same. And to this end the invention resides in arranging an operating member or prime mover to be moved horizontally and laterally of the machine and providing a train of mechanism between this element and the presser board adapted to transmit to the presser board and uniformly distribute thereon, the lateral pressure exerted on the operating member.

Other objects will appear and be better understood from that embodiment of my invention of which the following is a specification, reference being had to the accompanying drawings forming part hereof, in which I Figure 1 is a perspective of my invention in use. Fig. 2 is a detail vertical section taken through the lamp box showing the invention in side elevation and by full lines the position of the components when the presser board is depressed and by dotted lines the positions of these elements when the presser board is raised. Fig. 3 is a plan of Fig. 1 with the top or cover removed.

The stand herein designated generally by a and shown in my previous patent, is for use in the operation of making photographic prints with artificial light. The box or casing 5 which contains the incandescent lamps (not shown), is as shown in my prior patent, supported by uprights 6 rising from a base frame 7 the distance from the frame to the bottom of the box or casing being such as will provide a space at the front of the stand sufficient to permit of the introduction thereinto of the fore-legs and knees of the operator when the said operator is seated in a position relatively close to the front of the stand,

The top or cover 8v is hinged or otherwise suitably connected to the body of the stand to permit of its being lifted or otherwise removed when it is desired to have access to the mechanism about to be described and that shown in my previous patent as included in the casing. An opening 9 in the central portion of the cover 8 receives a transparent or translucent base 10 of glass or other suitable material, which is supported in the opening by a ledge 11, and this opening also is adapted for receiving when extended or unfolded, the hingedly united sections 12 and 13 of the presser board I) which presser board is suitably connected to the top as by hinges 14.

The mechanism for arranging the presser board on a sheet of print paper superimposed on the photographic negative arranged on the base 10 in the opening 9, comprises a prime mover or operating member 15 and a train of mechanism 0. The member 15 may be of wood or any material found suitable for the purpose and is arranged horizontally with one end suitably connected as by a hinge, to any desired portion of the stand as one of the rear uprights 6. The length of the member 15 is so proportioned to the distance between uprights on one side of the stand as to have its free end extend through the space between the uprights and the front of the stand, whereby, to permit of its being readily engaged by the leg of the operator when the said operator is standing, and the said member 15 is so arranged above the base frame 7 as to admit of its being readily engaged by the knee portion of the limb of the operator when the said operator is seated relatively close to the front of the stand. The normal position of the free end of the member 15 is away from the front upright on the right in Fig. 1, and in this position it is yieldingly held by the mechanism 0, which mechanism also operates to yieldingly hold the sections of the presser board in their normal elevated positions as shown by dotted lines in Fig. 2.

From the foregoing it is obvious that pressure in a direction laterally of the stand is required to operate the member 15 and since this pressure may be readily exerted on the said element by the knee portion of the limb of the operator when the said operator is sitting or standing, it will be manifest that the inconvenient limb movement required by the treadle mechanism to operate the presser board as shown in my prior patent, is eliminated.

The mechanism 0 is such as will operate the presser board to move vertically when the member 15 is pressed laterally. This mechanism which may be of any improved or desired construction is for the most part arranged in the casing 5 and has its terminals connected to the element 15 in the presser board Z). The end portion connected to the member 15 and herein shown as a con necting rod 16 moves horizontally with the member 15 and has a downwardly extendin portion 17 directed into a socket 18 carried by the member 15, a slot 19 being provided in the bottom of the casing to permit horizontal movement of the portion 17 therein. The end portion connected to the presser board Z) is formed with a view to distribute the pressure uniformly on the sections 12 and 13. A convenient structure for effecting this result is shown in the drawings, where it will be seen a stirrup 20 is arranged transversely of the section 13 with its ends pivotally connected to brackets 2121. This insures substantially uniform pressure through the free end portion of the section 13 while a rod 22 transmits such pressure from a rock arm 23 and the length of this rod is so proportioned to that of one side of the rock arm as to combine their widths to form two sides of a triangle when the presser board is extended, whereby to distribute the pressure transmitted to the rod by the rock arm, over the sections 12 and 13. The rock arm is arranged to swing vertically on an axle 2 1 herein shown as disposed within the casing with its opposite ends suitably connected to the opposite sides of the casing and suitably braced by the presence of across piece 25 and clips 26 which connect the axle to the cross piece. A suitable connection for converting the horizontal movement of the connecting rod 16 and operating member 15 into vertical movement at the rock arm and for restoring the member 15 to its normal position upon the removal of pressure and at the same time for raising the sections 12 and 13 from the opening 9, is effected between the rock arm and connecting rod 16 and in the embodiment shown comprises a horizontally disposed bell crank 27 connected at one end to the rod 16, and a link 28 connecting the lower end of the rock arm with the other end of the bell crank. A spring 29 disposed with one terminal connected to the casing and another to that arm of the bell crank lever which is connected to the link, operates when under tension to draw that side of the bell crank lever toward the front of the casing and as a consequence the other arm of the said bell crank turns in a rearward direction with respect to the casing, and thus operates to draw the connecting rod 16 in a direction to the left in Fig. 1, whereby, the member 15 connected to the said rod is normally away from the frontupright on the right in the said Fig. 1. Now this forward movement on the part of the first-named side of the bell crank lever operates to turn the lower side of the rock arm forwardly, whereby the opposite side is swung rearwardly and thereby turns the sections 12 and 13 upwardly and rearwardly. An auxiliary spring 30 connected to the upper side of the rock arm and the casing 5, may be employed to operate in conjunction with the spring 29.

Thus it will be seen that when the parts are positioned as shown by dotted lines in Fig. 2, pressure exerted laterally and outwardly on the member 15 will have the effect of forcing the free end of the said member outwardly and turning the bell crank and rock arm through their connections 16 and 28. This pressure is continued and increased to overcome'the action of the springs 29 and 30 until such time as the presser board sections are arranged well within the opening 9 and bear evenly on the print paper arranged on the negative. The pressure on the element 15 may now be maintained constant by holding the said element in contact with the front upright on the right in Fig. l until'such time as sufficient exposure is had, at which time the operator withdraws his limb from the member 15, whereupon the springs will operate to restore the parts to their normal positions and permit the ready withdrawal of the print.

What is claimed as new is:

1. In a printing stand, the combination with a presser board; of mechanism including a horizontally and laterally movable operating element for operating the presser board.

2. In a printing stand, the combination of a presser board pivotally connected to the stand, an operating element hinged to the stand and arranged to be moved horizontally and laterally with respect to the stand, and means connecting the operating element with the presser board.

In testimony whereof I aflix my signature in presence of two witnesses.

NELSON DE CLARK.

Witnesses:

JOHN A. DONNELLY, Jr., 0. JAMES ORoNIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents,

Washington, D. C. 

